irving



Aug. 11, 1959 A H. F. lRvlNG 2,899,065

' CENTRIFUGAL MACHINE Filed Deo. 15, 1954 v f 2 sheets-sheet 2 nitedStates Patent O CENTRIFUGAL MACHINE Henry Francis Irving, Saginaw,Mich., assigner to Baker Perkins, Inc., Saginaw, Mich.

Application December 13, 1954, Serial No. 474,940 1'2 Claims. (Cl.21o-3716) This invention relates to new and useful improvements incentrifugal separating machines and more particularly to continuouslyoperable machines of this type which are well-suited to separating avariety of granular, brous, or crystaline solids from liquid mixturescontaining the same.

Continuously operating push-type, single stage centrifuges have longbeen employed for effecting the separation of liquid and solids and arerelatively well known. However, it is an object of the instant inventionto provide a machine of this type which is particularly welladapted toseparating sugar crystals `from a slurry or mixture comprising thecrystals and syrup or mother liquor although having a generaladaptability for other purposes. Since the syrup in the sugar slurry ormassecuite is relatively viscous, many push-type single stagecentrifuges which have been used to separate mixtures of this type haveemployed longer baskets or screens so that the caked solids can beretained until they acquire the required degree of dryness.

Another factor influencing the length of the basket employed is Athewashing operation which is desirably carried on during thecentrifugation process to rid the caked crystalline particles of ash orimpurities. Actually, it is desirable to restrict the length of thebasket, for when the length of the cake is increased, the pusher mustdevelop a greater force to discharge it from the basket, which forcewill tend to compact and subdivide the individual crystals and also tendto buckle the cake. Clearly, if a pre-removal of the greater proportionof the mother liquor can be effected prior to the time the slurryreaches the basket and a portion of the washing operation can beperformed during this pre-removal of the liquid, a shorter basket may beemployed and less force will be required to discharge the cake. Whilemachines of this type have accomplished such a pre-draining operation,no one has previously designed a machine in which the pre-draining andbasket screens may be compactly disposed in concentric relation withoutsacrificing any of the effectiveness of the pre-draining operation.

Accordingly, one of the prime objects of the instant invention is todesign a centrifuge of the continuously operable, so-called pusher typeywhich incorporates means for pre-draining a maximum portion of theliquid from the solids prior to the time the mixture is passed to thebasket and yet is no less compact than machines in which no pre-drainingoperation is carried out. Such a machine will charge to the basketsolids which immediately form a firm cake that can be readily pushedwithout humping or stratifying and without imposing variable loads onthe basket.

Another object of the invention is to provide a very practical machineof the type described in which a portion of the washing operation can becarried out during the pre-draining stage of centrifugation.

Still another object of the invention is to provide a pusher typecentrifuge of simple and practical design in which impurities in themixture which are present.V

Fr* 1C@ largely in the mother liquor are largely eliminated prior to thetime the mixture is charged to the basket.

Another object of the invention is to design a m-achine of this type inwhich means is provided for mixing the relatively wet strata of cakedsolid directly adjacent the basket with the drier solids above it as thecake is discharged so that lumps or masses of sticky crystals whichbuild up and break oif will not form on the dry housing wall adjacentthe basket.

A further object of the invention is to design a very practical machineof the type described in which there is a re-location of the solidparticles between stages of centrifugation, thus mixing the relativelywet crystals adjacent the pre-draining screen with the drier crystalsoutward thereof when the mixture passes from the predraining screen tothe basket.

A further object of the invention is to provide a machine in which thefunnel for gradually accelerating the mixture to the speed at which thebasket is rotated also Serves as a pre-draining member, and means isprovided for channeling the pre-drained liquid to the opposite side ofthe pusher.

A further object of the invention is to design a machine in which thepusher is retracted by the pressure of the material itself in accordancewith the rate of feed of the massecuite and at the speed which the cakebuilds so that working of the solid particles and crystal breakdown isreduced to a minimum and the number of strokes per given unit of timetaken by the pusher and the cake thickness is in direct ratio to therate of feed and can be controlled thereby.

A still further object of the invention is to design a centrifugalmachine of the type described which is durable and rugged inconstruction, which comprises relatively few component parts of lasimple nature which are readily accessible for cleaning and inspection,which may be easily and simply disassembled for repair and replacementof parts, and will accordingly be relatively inexpensive to maintain andwhich can be economically manufactured and assembled.

With the above and other objects in view, the present invention consistsin the combination and arrangement of parts, hereinafter more fullydescribed, illustrated in the accompanying drawings, and pointed out inthe appended claims, it being understood that equivalent changes may bemade in the various elements of the invention, without departing lfromthe spirit of the invention or sacrificing any of the advantagesthereof.

In the drawings:

Fig. l is a part sectional, side elevational view of my novel centrifugeshowing the pusher in forward position..

Fig. 2 is an enlarged, fragmentary, sectional view thereof, the pusherbeing shown in rearward position. Fig. 3 illustrates schematically themanner in which the pusher is actuated forwardly by a hydraulic pump andis permitted to return under pressure of the material feeding into thebasket.

Fig. 4 is a sectional view illustrating schematically one of themultiple way valves which is employed in the system.

Fig. 5 is a sectional view illustrating schematically another valvewhich is employed in the system to control the valve shown in Fig. 4.

Fig. 6 is an enlarged, fragmentary View showing the material forcing thepusher rearwardly.

Fig. 7 is anenlarged, fragmentary view showing the circumferentiallyspaced lugs which connect the interchine comprises a base 10 with adrive housing 11 supporting bearings 12 and 13 in which a tubular driveshaft 14 is journaled. A drive sheave 15 mounted on the reduced end 14aof the shaft 14 is connected by belts 16 to the shaft4 of a motor 17which'is adapted to drive the shaft at relatively high speeds. r j iFormed as an integral portion of the shaft 14 is a pressure iluidcylinder 18, the two portions of which may be bolted together as at 19.A piston 20 keyed in the cylinder as at 21 so as to rotate therewith, isprovided in the cylinder 18, and is reciprocated in the cylinder in amanner which will be later described. A pusher control assembly C ofconventional design is provided to control the forward operation of thepiston 20 and the piston rod or shaft 22 is transversely bored as at 23and longitudinally bored as at 2.4 tov admit pressure fluid from theassembly C to the outer face of the piston 20 so as to drive the latterforwardly to the position in which it is shown in Fig. l. Provided inthe shaft 14 and cornmuriicating with the passage 23 when the piston isin rearward position is a port 23a leading to the control assemblyY C.Further, the internal diameter of the' shaft 14 is enlarged as at 25 totransmit iluid to the control assembly C through the transverse passage25a when the piston is moved forwardly and to admit iluid to the frontface of the piston when it is returned to original position by thepressure of the material feeding into the basket as will later bedescribed. A positive displacement constant delivery plump 64 (Fig. 3)supplies the pusher control assembly in a manner which will later becomeapparent.

The tubular shaft 14 extends from the drive housing 11 into a wethousing 26 which is bolted to the housing 11 and a drum or basket B iskeyed thereon as at 27, the basket B comprising a radial end wal-l orhub 28 with a perforated cage 29 having a screen 38 supported therein. Afrusto-conical pusher wall 31 is keyed as at 32 to the tapering end ofthe shaft 22 which extends into the wet housing 26 beyond the shaft 14,and a nut 33 threaded on the end of the shaft 22 maintains the wall 31in position. The wall 31 `has a laterally turned llange 31a which isrecessed as at 31b to receive a scraper ring 34. Additionally, anacceleratingr funnel or distributor member 35 having a laterally turnedflange 35a is supported a spaced distance from the portion 31a of thewall 31 on circumferentially spaced, integral lugs or bosses 36 formedon the llang'e 31a so as to form passages 37 between the ilanges 31a and35a leading to the screen 30. The funnel 35, it will be observed, isconcentric with the screen 30 and is substantially co-extensivetherewith. The annular llange portion 35a of the funnel 35 terminates aspaced distance from the basket 38 and serves as a leveling ring.

The outer end wall of the funnel 35 is bored as at 38 to freely admitthe slurry supply pipe 39 and the interior wall thereof is recessed asat 40 to carry a pair of superposed frusto-conical screens 41 and 42,the top screen 41 being a woven screen and the under screen 42 whichsupports the screen 41 being a mesh screen. Connecting with the inneredge of the recess 40` are angular passages 43 which lead through theflange 35a of the funnel and communicate with the passages 44 throughthe flange 31a of the pusher wall 31. When the wall 31 is in rearmostposition as shown in Fig. 2, it is spaced from the hub 28 of the basketto form a chamber 45, and liquid proceeding through the passages 44 willpass to the wet housing 26 through the circumferentially spaced ports45a in the basket B immediately adjacent thel wall 2S when the piston 20is in its rear position las Well as when itis in its forward position.

The outer end wall of the wet housing 26 terminates short of the basketB and `a throw-*olf ring 46 including an outwardly tapered flange 46aextending into a dry housing 47 is provided on the outer end of thebasket B. Supported outwardly of the flange 46a to rotate with thebasket B is a frustoeconical baille member 49 which includes a lateralflange 49a projecting radially inwardly beyond the screen 30 to channelthe solids discharged down to the passage 50 defined between therearwardly and inwardly extending portion of the baille 49 and the ring46. The baille portion 49 is secured to the base of the member 46 bywidely spaced lugs 48 which also support a forwardly and outwardlyextending frusto-conical baffle member 51 which directs the llow ofsolids from the annular passage 50 to the dry housing proper. Thebatlles 49 and 51 effect a thorough inter-mixture of the relatively wetsolid particles immediately adjacent the screen and the relatively drierparticles inward thereof in a manner which will be later described. Theparticles which were disposed in the caked mass immediately adjacent thescreen may have a residual liquid content of from 4% to 6% by weight,and this is what is meant by the term relatively wet as used in thespecification and claims. The liquid content of the solid particles inthe cake which are -located radially inward of these particles will be1% to 2% by weight and these particles will be accordingly termedrelatively dry.

The mixture may be `washed in the pre-draining stage of centrifugationby the laterally directed spray from a hose 52 which enters thestationary supply pipe 39 through a seal 53 and has a nozzle 52a on theend thereof for directing the wash liquid to the solids on the sides ofthe funnel 35. The spray from a second wash hose 54 can be directed tothe material on the inner portion of the screen 3G to remove anyremaining impurities. Partitions 55, 56, and 57 separate the wet housing26 into compartments 58, 59 and 60 which can be drained olf separatelythrough the discharge pipes 61 and, as will be apparent, the so-calledgreen and wash liquids may be segregated in this manner. A conveyor (notshown) may be provided in the lower portion of the dry housing to carryolf the dried and intermixcd crystals.

The pusher wall 31 is shown in rearward position in Fig. 2, and it willbe clear that this wall is moved forwardly to the position in which itappears in Fig. l when pressure iluid reaches the rear face of thepiston 20 through the ports 23a, 23, and 24, and exhausts from the frontof the piston through the passages 25 and 25a. This pressure iluid issupplied from a reservoir 62 (see Fig. 3) through lines 63 and 63a fbythe pump 64 which forces the iluid through a multiple-way valve 65 andthence into the collection chamber 66 in the collector C. The iluidwhich is forced out of the cylinder 18 when the piston 20 movesforwardly moves through the passages 25 and 25a into the collectionchamber 67 in the collector C, thence through a line 68, back to thevalve 65, and finally into a line 68a which leads to the reservoir 62.Alternatively, the iluid could return through the line 96 which willlater be discussed.

The valve 65 (see Fig. 4) is formed with an interior cylinder 69 inwhich is a slide 70 having lands 71, 71a, 72, and 73. Passages 74, 75,76, 76a and 77 which communicate with the lines `63, 63a, 68h, 68a and68, respectively, lead into the cylinder as shown, and in the positionin which the valve is depicted the lines 63 and 63a and 68 and 68a areclearly in communication, and the piston 20 is accordingly movedforwardly. The position of the member 70 is controlled by anothermultiple-way valve 78 which has a slide 79 in the cylinder 80 formedtherein. The one end of the slide 79 which has interior lands 81 and `82extends from the valve housing and has spacedapart flanges 84 thereon. Apin 85 lixed on the shaft 22 and movable in a slot 85a in the shaft 14has an annular ring 85h disposed between these flanges 84 and clearly asthe piston 20 moves forwardly, will tend to force the slide 79 to theright.

Passages 86, 86a, y87, 88 and 89 communicate with the interior of thecylinder 80, the passages 86 and 86a communicating with a line 90leadingto the reservoir, the passage `87 communicating with a line 91 leadingto a passage 92 inthe one end wall of the valve 65, the passagecommunicating with a line 93 leading to the line 63, and the passage 89communicating with aline 94 leading to a passage 95 in the opposite endwall of the valve 65. During the forward motion of the piston 20, thelines 93 and 94 are in communication to keep the valve 70 in theposition in which it is shown. By the time the piston 20 has reached thefront of the cylinder and is beginning to be pushed rearwardly (see Fig.6), the slide 79 has been moved to the right to open up the passage 487and line 911 to the passage 881 and line 93 and to permit the line 94 toexhaust to the passage `86 which leads through the line 90 to thereservoir 62. Thus, pressure fluid is forced through the line 91 to movethe slide 70 to the right and open up the passage 77 and line 68 abovethe valve 65 to the passage 74 and line 63 below the valve. Further, theline 63a will now exhaust to the line `68b as the piston 20 movesrearwardly. Since the line 96 leading to the reservoir 62 is always opento the line 68, the oil forced through the line 68 will take the path ofleast resistance (the line 96) back to the reservoir 62 and will notforce the piston 20 rearwardly. As the slowly building cake (see Fig. 6)moves the piston 20 rearwardly, however, oil from the line 68 undervirtually no pressure will fill the space in front of the piston 20 andthis is very important since the system must be maintained incentrifugal balance. The piston 20 will accordingly have a very rapidforward stroke and a relatively slow return stroke controlled by theamount of solid particles being deposited at S (see Fig. 6). If itappears that the rate of feed is not sullicient to build the cake up tothe leveling ring 35a, a conventional relief valve 97 which interposesresistance in the line 68a leading to the reservoir 62 can be cut in toslow the return rate of travel of the piston 20. A system such asdescribed wherein the return travel of the piston 20 depends on the rateat which slurry is fed into the system through the pipe 39 and the rateat which the cake builds is superior in a great many respects toconventional machines. Obviously, there will not be a continuous workingof the crystals of the continuously building cake which will mean lesscrystal breakdown and less passage of crystals through the screen 30.Further, rates of feed are often very different and the machine canoperate very eficiently at both low and high rates of feed. In theformer case, the cake will be permitted time to build up to the levelingring 35a so that it will have a maximum retention time on the screen 30.As the piston 20 moves rearwardly, the ring 8519 will, of course, returnthe slide 79 to the left back to the position in which it is shown inFig. 5 and the slide 70 will accordingly be returned to the left asshown. The stroke of the continuously reciprocating wall 31 is such asto discharge only the front portion of the casked solids S which arevirtually free of liquids to the dry housing 47.

Inroperation, the sugar slurry or massecuite reaches the interior of thebasket through the stationary pipe 39 and funnel 35 which graduallyaccelerates the mixture prior to discharging it through the passages '37to the screen 30. rlfhe greater proportion of mother liquor is drainedoff to the Wet housing 26 through the screens y41 and 42 prior to thetime the mixture reaches the screen 30 and a portion of the washingoperation to remove impurities not carried olf with the mother liquorcan also be carried out during this pre-draining operation. Liquidpre-drained through the screen 41 travels rearwardly through the meshesof the screen 42 which is within the recess 40 and thence proceedsthrough the passages 43 and 44 to the chamber 45 rearwardly of thepusher wall 31. Ports 45a as previously noted, drain the space 45 to thechamber 58 in the wet housing 26. The Wash hose S2 delivers a prescribedspray of water to the mixture on the screen 41 which is insuicient toood the retained solids such that diiculty will be encountered inpushing them when they reach the screen. When the solids reach thelatter screen 30, there is, of course, a relocation of the solidparticles as they pass from the screen 41 and the hose 54 thencecompletes the Washing operation.

When the solids are discharged from the outer end of the screen 30 bythe pusher wall 31, the relatively drier particles which were located inthe cake substantially inward of the screen tend to be fanned outwardly,while particles immediately adjacent the screen which are relatively wetwill not necessarily be perceptibly thrown axially outward of the screenand in conventional machines would leave the flange l46a of the ring 46in substantially a radial path. These relatively wet and sticky crystalstend to collect and in many instances will adhere and build up on thepartitioning wall separating the wet and dry housings before breakingoff in relatively large pieces. Since this deposition is unsightly andthe collections of sticky crystals are undesirable in the finishedproduct, I have found it practical to intermix the relatively wet andrelatively drier particles. The portion 49a of the bathe 49 catches anddeflects the relatively dry particles inwardly to the channel l50 sothat they pass through and become thoroughly intermixed with the wetterparticles. The.. resulting intermixture will not collect on thepartitioning wall referred to and will provide a uniform product.

It should be apparent that I have perfected a very efcient centrifugalmachine which is compact in design and permits ready access to itsvarious elements for cleaning and inspection purposes.

v kIt is to be understood that the foregoing drawing and descriptionthereof is in all cases to be taken as merely illustrative of theinvention rather than as limiting the scope thereof and for adetermination of the scope of the invention attention is directed to theappended claims.

It is further to be emphasized that various equivalent changes may bemade in the various elements which comprise the invention withoutdeparting from the spirit of the invention or the scope of the claims.

What l claim is:

1. In a centrifugal machine, a separating drum and end wall therefor,means for moving one of said end wall and drum axially relative to theother, means for revolvably supporting said drum, an imperforatedistributor shell disposed in concentric relation with said drum mountedfor rotation therewith and having a tapering interior surface with itsend of largest diameter spaced from said end wall to form a feed passagetherebetween, means revolving said drum and end Wall in unison, meansfeeding a mixture comprising liquid and solid components to the oppositeend of said distributor, means including screening spaced inwardly fromsaid tapering interior surface of the shell for pre-draining liquidcomponents from said mixture in the distributor shell and channelingthem through said distributor shell to the face of said end wall remotefrom the distributor shell, and means exerting a force to move said endwall rapidly forwardly removing said force at the end of the forwardtravel of the wall to permit it to return slowly under pressure of thesolids congregating in said feed passage so that the speed of the returnstroke is in direct ratio with the rate of feed.

2. The combination defined in claim l in which means is provided forslowing down the travel of the return stroke when the rate of feed isvery low to permit the solids to form a substantial cake on the interiorof the drum.

3. In a centrifugal machine, a perforate separating drum and end walltherefor, one of which is mounted for movement axially relative to theother; supply means feeding a slurry to said drum; means communicatingwith said supply means disposed opposite said end wall at a spaceddistance therefrom to form a feed passage therebetween for slurry toreach said separating drum from said supply means; means revolving saiddrum; a drive member connected with one of said end wall and drum fordriving one of said end wall and drum forwardly in one force exertingdirection; means associated with said drive member exerting a force tomove said drive member forwardly operable at the end of said forwardstroke to remove said force; and means disassociating said forceexerting means and drive member at the end of said forward stroke so noforce is exerted on the drive member thereby to permit the pressure ofthe solid components of the slurry building into a cake in said feedpassage to return said one of the end wall and drum which is drivenforwardly.

4. In a centrifugal machine; a perforate, separating drum and end Walltherefor one of which is mounted for movement axially relative to theother; supply means feeding a slurry to said drum; means communicatingwith said supply means disposed opposite said end wall at a spaceddistance therefrom to form a feed passage therebetween for slurryfeeding from said supply means to said drum; means revolving said drum;and means connected with one of said end wall and drum for moving one ofthe end wall and drum axially relative to the other; driving one of saidend wall and drum forwardly in one direction; and means for disablingsaid means moving one of the end wall and drum at the end of saidforward stroke to permit the pressure of the solid components of theslurry building into a cake in said feed passage to return said one ofthe end wall and drum which is driven forwardly.

5. The combination defined in claim 4 in which said means moving one ofthe end wall and drum axially includes a fluid pressure cylinderprovided on said machine and a piston fixed to said end wallreciprocable in said cylinder, means transmitting fluid under pressureto one face of said piston for forcing the piston in said direction,means exhausting fluid from the opposite face of said piston when thepiston is moved in the said direction, and means filling the cylinderadjacent said opposite face of the piston with fluid under no pressurewhen the Wall is forced to return to maintain the cylinder incentrifugal balance.

6. In a centrifugal machine; a relatively reciprocable, perforateseparating drum and end wall therefor; supply means feeding a slurry tosaid drum; means within said drum communicating with said supply meansand hav ing a peripheral surface disposed opposite said end wall andspaced therefrom to form a feed passage therebetween for slurryproceeding from said supply means to said drum; means revolving saiddrum; and fluid pressure means including; a source of fluid underpressure, an exhaust line opening to atmospheric pressure, and a fluidpressure cylinder and ram connected to said end wall; and means operableto communicate fluid under pressure from said source with one end ofsaid cylinder, while communicating the opposite end with said exhaustline to drive said end wall forwardly, operable at the end of saidforward stroke to divert said source of fluid under pressure from saidcylinder, while opening said end of the cylinder previously communicatedwith said source to said exhaust line so that the pressure of the solidcornponents of the slurry building7 into a cake in said feed passage canreturn said end wall.

7. In a centrifugal machine, a perforate separating drum, an axiallymovable end wall for said drum disposed within said drum, means rotatingsaid drum and end wall in unison, means simultaneously reciprocatingsaid end wall within the drum, a distributor funnel comprising animperforatc wall having an interior tapering collecting surface disposedin substantially concentric relation with said drum mounted on said endwall with its end of largest diameter spaced from said end Wall todefine a radial feed passage to said drum therebetween, screening on thecollecting surface covering said surface and spaced therefrom, means forfeeding a mixture comprising solid and liquid components to the end ofsaid distributor funnel remote from said end wall, the distributorfunnel being recessed to channel liquid components drained through saidscreening to the large diameter end of said distributor funnel, tubularlug's on said end wall supporting said distributor funnel with theinteriors thereof communicating with the recess in said distributorfunnel, said end wall having ports therein in communication with theinteriors of the lugs to channel liquid pre-drained through saidscreening to the side of said end wall remote from the distributorfunnel for discharge.

8. The combination dened in claim 7 in which additional screening ofrelatively heavy mesh mounted in the recess in said distributor funnelsupports said first-mentioned screening and assists in channeling saidliquid components to the large diameter end of said distributor funnel.

9. In a centrifugal machine; a housing; a separating drum within saidhousing; means revolvably supporting 'said drum within the housing; anend wall for said drum within said drum; means for moving one of saidend wall and drum axially in a reciprocable path relative to the other;an imperforate coniform distributor shell having an end of smalldiameter and an end of large diameter supported concentrically withinsaid drum with the end of large diameter adjacent said end wall; meansfor revolving said drum and said distributor shell; means for feeding aslurry having liquid and solid components into the end of said shellwhich is of small diameter; screen means mounted on the interior Wall ofsaid distributor shell at a spaced distance outwardly therefrom toprovide a channel between said screen means and shell for' fluidseparated by centrifugal force from the solids collecting on said screenmeans; and means connecting with said channel and leading from saiddistributor to said end wall for channeling the liquids so predrained toa face of the end wall remote from the distributor for discharge.

10. In a centrifugal machine; a housing; a separating drum Within saidhousing; means revolvably supporting said drum within the housing; anend wall section for said drum within said drum; means for moving one ofsaid end wall section and said drum axially in a reciprocable pathrelative to the other; a distributor shell section having an imperforateinterior surface which increases in diameter from an end of smalldiameter to an end of large diameter supported within said drum with theend of large diameter adjacent said end wall section; means forrevolving said drum and said distributor shell section; means forfeeding a slurry having liquid and solid components to the interior ofsaid shell section to said end of small diameter; filter means mountedon the interior surface of said distributor shell section at a spaceddistance outwardly therefrom to provide a channel behind said filtermeans for fluid separated by centrifugal force from the solids collectedby said filter means; and means connecting with said channel and leadingfrom said distributor shell section to said end wall section forchanneling the liquids so predrained to a face of the end wall sectionremote from the distributor shell section for discharge.

11. In a centrifugal machine; a housing; a separating drum within saidhousing; means revolvably supporting said drum within the housing; anend wall for said drum within said drum; means for revolving said drumand end wall; means for moving said end wall axially in a reciprocablepath relative to the drum; an imperfor'ate distributor shell having atapering interior wall portion with an end of small diameter and an endof large diameter supported within said drum for rotation therewith withthe end of large diameter adjacent and spaced from said end wall; meansfor feeding a slurry having liquid and solid components into the end ofsaid shell which is of small diameter; a screen mounted on the interiorwall of said distributor shell at a spaced distance outwardly therefromto provide a channel behind said screen for fluid separated bycentrifugal force from the solids collecting on said screen; said endwall having port means leading from the face thereof adjacent saiddistributor shell to a face 9 of said end wall remote from thedistributor shell for discharge; and means connecting the said channelwith said port means of said end wall.

12. The combination defined in claim 11 in which said means connectingthe channel and port means comprises a radially extending ange on saiddistributor shell at its end adjacent said end wall having port meanstherein communicating with said channel; and circumferentially spacedtubular supports mounting said distributor shell on said end wall andextending between said end wall and ange, communicate said port means inthe ange and in the end wall.

References Cited in the le of this patent UNITED STATES PATENTS UNITEDSTATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.. 2,899,065August ll, 1959 Henry Fralnois Irving It is hereby certified that errorappears in the above numbered patent requiring correction and that thesaid Letters Patent should read as corrected below.

Column 7, line l2, after "therefor" insert a comme; line I8, sftrke out"and"; line 21, after "other" strike out the semicolon Signed and sealed'this 31st day of October 1961:o

( SEA L) Attest:

ERNEST W. SWIDER DAVID L. LADD Commissioner of Patents Attesting Officer4 USCOMMDC

